William Emanuel McElveen (1768-1826)

William Emanuel McElveen, born in SC about 1768 and passing away about 1826 in Bulloch County, Ga, is my husband's GGGgrandfather.According to my research, W E's father was William McElveen, born about 1745 in VA.That's as far back as I have been able to track.I'm hoping some you will have more information on the pedigree of W E.I'd like to find out where this family tree originated, in Scotland or Ireland.Can anyone help?